[Elecraft] [K3] KIO3 serial port replacement or repair?

[Martin]

Elecrafters,

i believe i zapped KIO3.

2 Symptoms:
I can't use the DTR and RTS lines for cw keying via my logging
software.
ACC will not switch on the external Transverter.

Any idea how to repair the board?

On the Elecraft K3 parts and Mods kits page i see REMIOUPGD, is this the 
device i need for replacement?

Thank you.

--

Martin, DM4iM